Hornresp

[David McBean]

Hi soho54,

Originally Posted by soho54

I have some questions about when it is best to use the Par calculations instead of the conical.

As there was no new width or starting height input I have been assuming that the Par just calculates a set profile Parabolic dimensioned segment. As the Parabolic oval is a better match for a rectangle it should work out pretty good.

With this in mind is it better to switch over to the Con sections if the horn is running closer to a square at that point of the horn?

I am not sure that I understand your question correctly, but in essence it is theoretically more accurate to use a parabolic area expansion rather than a conical area expansion when the horn has two parallel walls and two linearly-tapering walls (similar to the first segment of a Klipschorn bass horn).

In practice, the difference in SPL results using either a parabolic or a conical expansion will be minimal in most cases for a bass horn. The difference in physical volumes however, could be reasonably significant in some situations.

Because Hornresp assumes an axisymmetric (circular cross-section) design, width and height dimensions are not needed when calculating performance results.

Originally Posted by soho54

Also do you know if Bjørn has posted/published these calculations anywhere yet?

Bjørn has not published his work yet, but he may do so eventually.

Kind regards,

David

[David McBean]

Originally Posted by epa

it would be nice if you can implement x-overs and/or eq in hr.

Hi epa,

Please see my Post #1369.

Kind regards,

David

[epa]

Originally Posted by David McBean

Hi epa,

Please see my Post #1369.

Kind regards,

David

sry, missed that.
i get your point.
it would be helpfull though.
anyway i enyou your program verry much.thank you for that.

[David_Web]

Getting some strange result in the loudspeaker wizard with this one using combined response.


ID=28.00
Ang=2.0 x Pi
Eg=2.83
Rg=0.00
Cir=0.40
S1=400.00
S2=400.00
Exp=100.00
F12=0.00
S2=400.00
S3=1000.00
Exp=40.00
F23=62.71
S3=1000.00
S4=3000.00
Exp=60.00
F34=50.12
S4=0.00
S5=0.00
L45=0.00
F45=0.00
Sd=839.82
Bl=18.66
Cms=1.87E-04
Rms=4.99
Mmd=50.12
Le=0.71
Re=5.00
Nd=1
Vrc=0.00
Lrc=0.00
Ap=0.00
Lpt=0.00
Vtc=10000.00
Atc=840.00
Pmax=100
Xmax=5.0
Comment=NEW RECORD - B&C 15pe40_3 BLH

[David McBean]

Originally Posted by David_Web

Getting some strange result in the loudspeaker wizard with this one using combined response.

Hi David_Web,

Many thanks for this feedback - I get an incorrect result also.

I will investigate and let you know when the bug is fixed.

Kind regards,

David

[mige0]

There seems to be something wrong with displaying Sd here ?



Michael

[David_Web]

Looks ok too me?
Don't forget you have two drivers in series.
Happened to me =)

[mige0]

Yes it certainly looks like this - but where do I have to select that other than here:



same here:




???

Michael

[witasso]

Dear Mr. McBean:
It seems there is another bug in the Compound Horn feature. Using the Mige0 values, the results are improper, with other drivers and parameters the same effect occurs. Any even smallest change in the values S1, S2, L12, S5, S6 or L56 changes drastically the response plot.
The OS is Vista 64-bit.

[Kolbrek]

The first dialog selects the number of drivers to drive the horn (speaker), the second selects the number of horns (speakers) (each with the number of drivers specified in the first dialog) used together.

In the terminology of Hornresp, the driver is the driving unit itself, while the speaker is the complete thing, including driver, front and rear chambers, ports, horns etc.

Bjørn